Adelaide will appeal over what they believe is "grossly inadequate" AFL draft compensation for losing key defender Nathan Bock to Gold Coast.

Under the AFL compensation scheme, the Crows stand to receive a pick at the end of the first round of any of the next five national drafts.

The level of compensation takes into account a player's age and the size of their contract offer from Gold Coast.

The return for Bock falls in the third of five bands of compensation.

But the club argues a player of Bock's age and ability should have fallen in one of the higher two bands.

"We believe that if Nathan was available on the open market he would certainly attract much more than one first round draft pick from another club," Adelaide football manager Phil Harper said in a statement.

"He was an All Australian two years ago, when he also won our club champion award.

"He is only 27 and if he was still on our list right now he would be rated right near the top.

"We believe that compensation for a player of Nathan's ilk would be a minimum of band two.

"Because of all this, the club owes it to its members and supporters to strongly appeal this decision to the AFL."

Under the top band of compensation, a club receives two first-round picks.

The second band involves one first-round pick, but it comes immediately after a club's existing first-round selection, rather than at the end of the round.

The AFL originally devised a more complicated scheme, under which the compensation formula took into account other factors, such as club best and fairest voting and where in the draft a player was originally recruited.

But they announced the simpler, revised scheme in June in an attempt to allay some clubs' concerns that they would not be adequately compensated, particularly if young players were poached.

They also raised the maximum compensation level from one first round pick to two.

Port Adelaide, which lost defender Nathan Krakouer to the new AFL club, will receive a second round pick, to come immediately after its existing second round choice in any of the next five national drafts.pensation pick after their second round selection.

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